Pinion puller



Feb. 3.1925. 1,525,274

G. DAY

PINION FULLER Filed Sept. 29, 1922 i atented Feb. 3, 1925.

ATEN T OFF [CE GRAFTON DAY, mason c, VIRGINIA.

PINION Application filed September To all, whom it may concern:

Be it known that GnAr'roN DAY, a citizen of the UnitedStates of America, residing at Norfolk, in the county of Norfolk and State of Virginia, has invented new and useful Improvements in'Pinion Pullers, of which the following is a specification.

The object of the invention is to provide asimple and inexpensive and at the same timeefficienttool for use in removing worn or damagedpinions from the armature shafts of motors used in connection with cars, motor. trucks and the like without risk of injury to or removal of the axle carried gear -o1' other related parts of the mechanism and underordinary conditions without displacing themotor or otherwise disturbing the mechanism; and with this object in view the invention consists in a construction and combination of parts of which a preferred embodiment isshown in the accompanying drawings, wherein Figure 1 is, a side view of a pinion removing apparatus applied in the operative position to a damaged pinion in position for removal: thereof from the shafts.

Figure 2 is a sectional view taken longitudinally of the pinion removing device.

Figure 3 is an end view thereof.

The apparatus consists essentially of a cage 10 and a feed screw 11 threaded in a feed nut 12 which is carried by the cage, the latter being provided with a foot flange 13 for engaging the inner side of the pinion 14 carried by an armature shaft 15 and which through the gear 16 serves to operate the drive shaft 17 of the vehicle.

The cage is of cylindrical form in general outline with a lateral opening 18 which affords clearance for the portion of the gear 16 which is in mesh with the pinion to be removed, and furthermore the cage is preferably of sectional construction, being divided on a longitudinal diametrical plane as indicated at 19 to provide separable semicylindrical sections 10**10 shown clearly in Figure 3. For maintaining the sections or members of the cage in an assembled ondition when the device is not in use or when pressure incident to the removal of the pin ion has been relieved, there is employed a retaining ring 20 encircling the cage and adapted to be removed to facilitate the application of the cage to the pinion.

The feed not which is provided with an exposed wrench seat 21 preferably has a FULLER.-

29, 1922. Serial No. 591,260.

swivel bearing on the cage formed. by an ear head 22 provided with a conical seat 23 for engagement with an interior conical bearing surface2 i at the outer end of the cage so that with the foot flange of the cage engaged with the inner surface of the pinion as shown in Figure 1 and tlie' ,fee'd screw.in terminal Contact with the end'of the shaft 15 for the purpose of exerting pressures in opposite directions upon the pinion and shaft to remove the former from thelatter in a direction parallel with the axis of the latter, the interlocking relationof the feed nut and the outer end of the cage due tothe concave and conveii conical bearing surfaces 23 and2et thereofserves tohold the members of the cage. in their proper relation and maintain the divided foot flange thereof'in engaging relation with the pinion. z

' The feed screw at its inner end is preferably provided with a swivel cap 25 having a center point 26 for engagement withthe end of 'the shaft and carrying'screw keys 27 which engage an annulargroove 28 in the inner end of the feed screw. Said feed screw is also provided at its outer end with a wrench seat 29 whereby the same may be turned to cause relative feeding movements of the feed screw and cage. The shoulder 30 at the inner end of the wrench seat 21 of the feed nut is spaced from the adjacent outer end of the cage sufliciently to permit of longitudinal movement of the feed screw to disengage the concaved conical bearing surface 23 from the convexed conical hearing surface of the cage so that the members of the cage may be separated.

Obviously while the members of the cage are held in their proper relation when pressure is being applied by the feed screw in the act of removing a pinion from the armature shaft, the relief of pressure due to the disengagement of the pinion would permit the members of the cage to separate if it were not for the use of the retaining ring 20, but when pressure is being applied by the feed screw the retaining ring is re-' lieved of strain due to the interlocking relation between the feed nut and the conical bearing of the cage.

Moreover inasmuch as a swivel bearing cap is provided at the inner end of the feed screw, the operation of the latter in removing a pinion does not cause arotary movement of the armature shaft owing to the fact that the pinion is in mesh with the gear, but

with certain types cf trucks requiring the displacement'of the motor in order to give access'to the pinion,the disengagement of the pinion from the gear leaves the armature shaft free to rotate, and under these conditions it is usually necessary to place a second wrench on the wrench seat of the feed nut to hold the latter and therefore the cage stationary during the turning of the feed screw to effect the removal of the pinion from the shaft.

It will also be understood that the rotation of the feed screw and the feed nut in the removal of a pinion, under ordinary con ditions, is optional and alternative, as the rotation of either will cause a relative movement axially of the cage and feed screw. If only turning movement is applied to one of said members the other is held against rotation to the end that there may be a relative rotative movement of said members.

Having described the invention, what is claimed as new and useful is 1. In a device for removing a pinion from the shaft to which it is fitted, a cage to receive the pinion and provided with a foot flange for engaging the under surface thereof, and a feed screw rotatably mounted for axial movement in relation to the cage and having means whereby rotary motion may be imparted thereto, the cage being longitudinally split to form separable members and a feed nut in engagement with the feed screw having an interlocking swivel engagement'with the cage for retaining the members thereof in their operative relation. r

2. In a device for removing a pinion from the shaft to which it is fitted, a cage to receive the pinion and provided with a foot flange for engaging the under surface thereof, and a feed screw rotatably mounted for axial movement in relation to the cage and having means whereby rotary motion may be imparted thereto, the cage being longitudinally split to form separable members and a feed nut rotatably mounted in the cage in engagement with the feed screw, said feed nut and cage being provided respectively with concavecl and convexed bearing surfaces for interlocking engagement.

3. In a device for removing a pinion from the shaft to which it is fitted, a cage to receive the pinion and provided with a foot flange for engaging the under surface thereof, and afeed screw rotatably mounted for axial movement in relation to the cage and having means whereby rotary motion may be imparted thereto, the cage being longitudinally split to form separable members and a feed nut rotatably mounted in the cage in engagement with the feed screw, the feed nut and cage being provided respectively with concaved and conveXed conical bearing surfaces in interlocking engagement.

In testimony whereof he affiXes his signature.

GRAFTON DAY. 

